I wouldn't fire Gary Kubiak. At least not this week. General manager Rick Smith is safe, too. For now.
But the clock is ticking. They've had four years to rebuild the Texans, and that's enough time. If they can't get the job done in four years, it's unlikely they're ever going to get it done.
The Texans are close to being really good, but that's a loser's lament. If Chris Brown hadn't fumbled at the goal line against Jacksonville. If he'd gained one more yard against Arizona. If Kris Brown hadn't missed field goals against Indianapolis and Tennessee.